import time
# -*- coding: utf-8 -*-
# @Author: tan
# @Date:   2019-09-26 17:17:16
# @Last Modified by:   tan
# @Last Modified time: 2019-09-27 14:51:25
a = 10
b = 3
count = 10**7
st = time.time()
while count >= 0:
    temp = a
    a = b
    b = temp
    count = count - 1
et = time.time()
print(et - st)
